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Unit 14 Magnetic Induction

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Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss Lenz’s law. Review the formula for R-L time constants.

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Unit 14 Magnetic Induction Current flowing through a conductor produces a magnetic field around the conductor. Current flowing out Current flowing in

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Unit 14 Magnetic Induction A voltage is induced when a conductor cuts magnetic lines of flux.

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Unit 14 Magnetic Induction Reversing the direction of movement reverses the polarity of the voltage.

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Unit 14 Magnetic Induction Reversing the polarity of the magnetic field reverses the polarity of the voltage.

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Unit 14 Magnetic Induction Left-hand generator rule.

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Unit 14 Magnetic Induction Voltage is induced by a moving magnetic field.

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Unit 14 Magnetic Induction A single-loop generator.

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Unit 14 Magnetic Induction Increasing the number of turns increases the induced voltage.

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Unit 14 Magnetic Induction Lenz’s Law An induced voltage or current opposes the motion that causes it. Please note: Inductors always oppose a change of current!

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Unit 14 Magnetic Induction Inductance is determined by the physical construction of the coil.

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Unit 14 Magnetic Induction R-L Time Constants T = L / R T = time in seconds L = inductance in henrys R = resistance in ohms This formula describes the time necessary for current in an inductor to reach its full Ohm’s law value.

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Unit 14 Magnetic Induction Review: 1.When current flows, a magnetic field is created around the conductor. 2.When a conductor is cut by a magnetic field, a voltage is induced in the conductor. 3.The polarity of the induced voltage is determined by the polarity of the magnetic field.

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Unit 14 Magnetic Induction Review: 4.Three factors that determine the amount of induced voltage are: a.the number of turns of wire. b.the strength of the magnetic field. c.the speed of the magnetic flux cutting action.

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Unit 14 Magnetic Induction Review: 5.Induced voltage is always opposite in polarity to the applied voltage. 6.Inductors oppose a change of current. 7.Inductance is measured in units called henrys (H). 8.Iron core inductors are wound on cores of magnetic material.

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